notifier: forget unlock before return (#7133)
notifier: forget unlock before return (#7133)

Signed-off-by: BurtonQin <e1b29827aeb064f0a812e717f153e026adcbedd1@gmail.com>

Co-authored-by: root <dc76e9f0c0006e8f919e0c515c66dbba3982f785@neon-cats-4.localdomain>
GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,kangwoo/prometheus,alileza/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,prometheus/prometheus,keegancsmith/prometheus,kangwoo/prometheus,prometheus/prometheus,keegancsmith/prometheus,alileza/prometheus,alileza/prometheus,alileza/prometheus,kangwoo/prometheus,keegancsmith/prometheus,kangwoo/prometheus